Marion is observing the velocity of a cyclist at different times. After four hours, the velocity of the cyclist is 14 km/h. After nine hours, the velocity of the cyclist is 4 km/h. Part A: Find the rate of change for the cyclist from hour 4 to hour 9. (2 points) Part B: Write an equation using the point-slope form equation that can be used to describe the velocity of the cyclist at different times. (4 points) Part B: Change your point-slope equation from part B to a slope-intercept equation. (4 points)